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A thin circular disc of radius a has a total charge Q uniformly distributed over it. It lies in
the x - y plane, centered on the origin. The charge density on the disc is p(F) =
e
ng²
8(2') for x2 + y2 ≤a² and 0 elsewhere. Calculate (a) the electrostatic potential and
(b) the electric field at a general point z on the positive z axis.

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